Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.8: Poster
Montag, 18. März 2024, 15:00–18:00, Poster C
Superconductivity in noncentrosymmetric lanthanum sesquichalcogenide La3Se4 — •moumita naskar1, soumen ash2, debendra prasad panda3, chandan kumar vishwakarma4, brajesh kumar mani4, a sundaresan3, ashok kumar ganguli2, rajib sarkar1, hans-henning klauss1, and dmytro s inosov1 — 1Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany — 2Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India — 3School of Advanced Materials and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India — 4Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
We have discussed the superconducting properties of lanthanum sesquiselenide La3Se4 with superconducting transition temperature Tc=8.5 K. It crystallizes in the noncentrosymmetric cubic Th3P4-type structure with space group I-43d. Specific heat measurement classified La3Se4 as a strongly coupled superconductor. To determine the nature of the superconducting gap symmetry of La3Se4, 139La-NMR measurements have been performed. From the density functional theory based first-principles simulations, we observe the number of states at the Fermi energy is dominated mainly by d and f electrons of La. Furthermore, we observe band crossings along the high-symmetry k lines in the vicinity of the Fermi energy. These bands are observed to split due to the removal of spin degeneracy associated with spin-orbit coupling, with the splitting energy ESOC= 65 meV.
Keywords: Noncentrosymmetric superconductor; Lanthanum sesquiselenide; Antisymmetric spin-orbit coupling; Strongly coupled superconductor